1916 Lithgow No. 1 Mk. 111

[Homer]

Interesting I have a 5MD '16 Lithgow with a H stamp on the Butts wrist and windage rear sight and mag cut off I think it still has the original H barrel, now I may be wrong and have in the past it has no scalloped section on the left rear of the fore wood for a sight plate.
I have heard that WWI Marksman were issued these with the heavier barrel, I will dig it out of the safe as it only sees the light couple of times a year for a drink of BLO/Min turps and an oil up and wipe down and back in the safe it has a pristine 5MD Lithgow 07 and '16 Lithgow Teardrop scabb as well they cost more than the rifle to get together !!!
I may feel energetic and get it out of the safe as the safe it resides in is a right pain in the rectum to get to.

Cinders the earliest lithgow heavy barrels are dated early 30's or perhaps late 20's, I can't remember and the factory H model conversions were modified during the 30's. It sounds like you have one of these but its Not likely any WW1 marksmen would have used used them.