All About Roamer Cases

Roamer made the majority of their own cases entirely in house from 1923 to about 1973. Due to this, they didn't bother marking their own cases specifically as to manufacture. Before 1930 ish various other cases were used, particularly in the USA, I guess they were cased there. Some early waterproof cases by Taubert and Fils (Borgel) were used in the 1930s. After 1973 they used some supercompressor cases by Piquerez, and in about 1975 attempted to have some cases made in Hong Kong (which largely failed due to the manufacturers inability to reliably meet the machining precision required for the patent cases). The original company went out of business in 1976 so there are very few of these later examples around. Some early roamer cases were marked LTG, which was one of their brands. Other brands made by Roamer (MST), such as vidar, had generic cases.
I should probably mention solid gold cases, but the truth is there is little information. Gold cases were made by a number of external case makers, of which I have seen (amongst others) Dennison, Handly and D Shackman and Sons (made cases for Rolex etc.). Some 1940s/1950s cases are marked Roamer, and some late 1960s Stingrays had solid gold cases and were 100% made by Roamer in house. In general, Roamer preferred to leave manufacturing of gold cases to external makers as fluctuation in gold prices made it difficult to manage - indeed I was told by the former owner that Roamer essentially lost money on every gold case they made.
So if it is between 23 and 73 you can be fairly certain it is a case made by Roamer, unless it is, gold, a recased movement or pre 1930s USA model.
Roamer was very proud of making every screw, dial, case, plexi, hand, movement etc. in house. This only started to fade after the family stopped running the company in 1968.

The Patent Case Type

Case and model numbers can be a source of confusion, and then you throw into the mix the type I and type II cases. Hopefully the following will make it all clear, as we are actually talking about 3 different things. The case type is actually very simple.
Type I This is the first type of case, as originally patented by E.Morf in 1941. This case was used until 1955 when the patent expired.
Type II When the original patents expired, Roamer introduced 4 new patents improving the design. Early Type II cases were not marked inside with a case number
Type IIa Roamer never had a Type IIa case, but from the late 1950s the Type II cases had a case number stamped inside, and I will refer to these as Type IIa.
Type IIb From 1966, all type II cases were marked with an external model number and the case number stamped inside. I will refer to these as Type IIb cases.

The differences between the two case types are in both ease of manufacture and depth, with the Type II giving a much thinner possible profile than the bulky type I. Perhaps more importantly, many Type I cases have suffered substantial sweat corrosion around the bottom of the bezel - especially in humid climates. The Type II case extends the stainless steel back out under the bezel, protecting it from degrading in this way. A very successful change, as no Type II cases suffer from bezel corrosion observable on Type I cases.

There are other differences, a Type I case uses a flat dial, a Type II case can use either a flat or curved dial, and the rehaut is much finer on the type 2 case. The following brochure (in German, but it should be clear enough) shows the differences between the Type I (old) and Type II cases (new). Also you can see the dial and rehaut differences highlighted and note that the instructions for dismantling are different, with the Type I pressing out with finger pressure, while Type II uses a case knife initially - open image in a new tab to see full size. At the end of this page you can see the Roamer tool and dies for assembling and dismantling these watches.


Case Numbers

The original Type I and early Type II cases had no case numbers, but case numbers were retrospectively assigned and can be looked up in a table using the calibre number and case diameter. In Type IIa a case number was stamped inside the case - and in order to see it, the movement needed to be removed. This number refers to the inner case. This case number is all that is needed to determine the crystal, crown length, stem, rehaut etc.
The case number is a 6 digit number, the first 3 digits being the case and the second 3 digits being the calibre,
e.g. 169 471, as in this following example in a Type IIb case:


Model Numbers

From 1966, a model number was introduced on the outside of the case back, on type IIb case, starting with MOD like this.

This is not to be confused with the internal case number, nor the 4 patent numbers that appear on the water proof cases. This number details the style, shape and material of the outer bezel into which the inner bezel fits. Therefore multiple models with different model numbers can share the same case number. The following shows how to decode the model number:
MOD CAL - 1234.567
CAL3 digit calibre number
Digit 1case closing method:
1 = Patent waterproof casing system
2 =Screw Back
5 =Compression back - up to and including 200m compressor cases
8 =particularly flat cases to house the Peseux movements (thanks to Zeityeti)
9 =Special casing system - one offs, e.g. Stingray S with additional rubber o-ring, Mustang 301 front loader etc.
Digits 2 and 3case material:
10 = chrome
11 = profectus
12 = stainless steel
21 = 10 micron yellow gold
23 = 20 micron yellow gold
25 = 40 micron yellow gold
31 = 10 micron rose gold
33 = 20 micron rose gold
35 = 40 micron rose gold
61 = 14K yellow gold
Digit 4purpose unknown, most often a 0 sometimes a 9
Digits 5, 6 and 7style

Hopefully this has gone some way to clearing up the mystery of Roamer case numbers.

Crystals, Crowns and Stems

The following PDF scans are from the 1966 and 1973 Roamer Technical manuals. The 1966 scans include early Type I and Type II cases, and identify appropriate crowns, stems and crystals. The 1973 scans include the 1966 information plus the later Type IIa cases and special cases, such as the diver watches, the electronic cases, Red Sea and so on.

Case Opening Tools

There are two sets of dies that I have so far managed to find - the first smaller set is just for the Anfibio range, the larger set covers a much larger range including the divers, chronographs and some of the other special cases.

And the dies themselves:

Of course we can't forget the press tool itself - I've only ever seen one for sale, and I bought it.

Finally the family photo:


All text and images are either © Kris Bubendorfer 2011-15 or © Roamer Watch Company.