Help with Disston Back Saw Repair and ID

I acquired five Disston backsaws in a auction recently. 4 of the 5 are more recent makes, but I was able to date the last one as a bit older, 1917 to 1940 based on the medallion.

The blade is 12” in length, 0.032” thick, with 13 points per inch. Depth of cut is ~2-1/4 inches at the toe, ~3” at the heel. I’d really like to know what model of saw this is, but I haven’t seen anything online that has the same degree of taper from the heel to the toe. In all other respects, it looks to be a No. 4 or No. 7. There is no etching on the blade.

Besides that, I’ll need to perform a minor repair to the plate. If you look closely in the pic below, you’ll see a slight ding in the plate. I’ve read a few good tutorials and seen some OK videos on how to fix this, but I’d really appreciate a link to a GOOD video to help me out. I figure I can practice on one of the other saws if needed.

Thanks for any help.

-- Dylan C ...Seems like all ever I make is sawdust...