Nice watch! Have it serviced and wear proudly.
215 999 is actually the case number.
It is most likely from somewhere between 1955 and 1960..
https://www.cousinsuk.com/category/filter/roamer-case-parts-by-case-number
There are tech sheets to be download from cousins site, that will show you possibile part compatibility with other case numbers.
The movement should be MST420 which is an auto.
The watch is a front loader - one needs to remove the split stem, crystal and dial ring, then the movement can be removed from the case. Make sure to have a watchmaker on it, don't play on your own
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