Hello.

The H3, small t are the early and not the later dials and of course you can find Valjoux 23 signs, because it is a Valjoux 23, a Valjoux 23 with flyback function(mean, that the original safety was demounted) and for this the name is Valjoux 230!
Look at the hack function, because often the hack function become victim of a bad revision and you can imagine, what else happend if they are not able to keep the main functions alive...
To find a 1550 with all original is nearly impossible, because it was a tool watch in a federal life!

F.D.