Marks 21,
Great thread and keep us posted. I too have been wanting to try and take a deer with one of my Hollenbeck/TBG guns. My wife's family has a farm in WV and my goal is to take a WV buck with a WV Drilling!! I took a look at several of my Hollenbeck/TBG/Royal guns and they have varying front sights as well. The firt pic below shows an early (single digit SN# - gun on left)with a completely different front sight and then three other guns with the two that have been previously posted.

The second pic is one with the rear sight in the highest position. For all of my Hollenbeck/TBG/Royal Guns the rear sight is identical.

Finally, the third picture is of a 16/16/25 Stevens Hollenbeck with a peep site neatly set in the stock, just ahead of the comb per one of the discussions.

I apologize for the sub par pictures as I did these in a hurry on my phone with limited natural light. If anyone wants a specific pic I will try to post that.