.I still have yet to run into a Hall's... so I'm not of much help. I did poor over what little I have of books, catalogs, and files in hopes of helping you - but also for myself, as I'm curious; just how many types of locks did they use and what are we apt to encounter? The answer is... not many.
As it's already been mentioned, the most prevalent by
FAR is going the be Hall's DE lock. The drive wheel on these (as you already know) has 10 gates, 9 of which are false. Take an accurate wheel count before ya really get goin' Chad. Some had 3 wheels, others 4. Technically, I should say
3 wheels + drive wheel (4# combo) or...
4 wheels + drive wheel (5# combo).
The handle on yours (next to dial) should turn CCW to open.
The proper dialing sequence for these locks:
(4# combo) LRLR ... and... (5# combo) RLRLR.
There's also a possibility you open it up to find an inner-chest... double the fun
They also used an S&G 6575, but I agree with Bitbuster... there's basically a zero percent chance here. This was an indirect-drive, 4 wheel lock, normally used on vaults or Banker's safes.
And of course, the famous Hall's 'Premier'' lock. All of them being 5 wheel. Again unlikely. These I think were used more so on the high-end safes and some inner-chests. From what I've heard, they're quite rare today and we could only be so lucky to stumble upon one.
Lastly, (
this one might also be rare), I
did come across what we would consider a more 'standard' lock, i.e. normal drive cam and drop lever. It was believed to be made by Halls. 3 hand-change wheels. The lever; I couldn't tell if it was spring-loaded or gravity driven. Drive cam; the sloped RCP we're use to. Dialing would be LRL Right to Stop.
So, we have to wait a whole
month?!