They seemed to have made quite a few different ones. I have a few other types of DOE'S as well and then some combos. Definitely makes sorting a little tricky
I have some like that. Could be a few different makers but usually if no markings on the handle or cap thing it's a stanley hurlwood with a really hard to see amd small marking on the shaft.
That one is pretty sweet! And I wouldn't necessarily call it a collection ha. I would like to get rid of every single one of them. It's shrunk down some but still plenty left If you were interested
One side says 528 and the other very clearly says 529. Pretty sure it's a 528 though. I think lugz posted a 529 at one point and it was a different size