Hello Kim Catton,
The Polaroid Automatic line of cameras is largely different in construction, or in rangefinder, roughly:
100 Automatic - glass lens, exposure compensation, TTL Flash (bulb) and exposure, flash sync
250 Automatic - improves rangefinder to have viewing and focus window in same window; two versions of rangefinder for these, with a slightly higher magnification in early versions, parallax correction in rangefinder (crude)
350 Automatic - adds electronic timer for film peeling; uses different battery than 100 or 250
360 Automatic - changes the 3000 ASA setting; has a rechargable flash unit (avoid)
450 Automatic - different flash than 350 or 360 that uses AAA batteries
In general, the flash sync for the Polaroid flash has a weird extra plug, but it will connect to a regular sync cord for using modern flash. I have the old Polaroid bulb flash for my 250 Automatic. While that is TTL flash control with a bulb, in practise it is not that great. My preference is to use a more modern flash with a sync cord, either with the flash unit set to automatic, or by manually setting the flash. It is also useful with studio strobes, if you meter first with a hand held flash meter.
The model 180, 190, or slightly rarer 185 are all manual shutter and nicer four element lenses. Unfortunately these are all high priced, despite being based upon body designs similar to the other steel body Automatic models. Also, all the other model numbers for this range are plastic body designs, and often plastic lenses.
A G Studio