It's wonderful to have an heirloom like this, a great piece of family history. Based on the serial number, your watch is from the early 1940s and the cal 30T2 is a high-quality movement that many collectors find very desirable. Did you also get a photo of the inside of the case-back? That's where the reference number (aka model number) is often stamped.
Even with that reference number, however, you may find that your watch doesn't look exactly like other examples of that reference. For one thing, there were often several dial/handset variations for a given reference. Also, you should be aware that old watches like this have often been repaired/modified over the years with replacement parts (e.g. hands), and dials repainted to repair old damage. So they don't always look the way they did originally. Unless you are a hard-core collector, this is not something to be concerned about.
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