Yeah, post a better image. But the 10.07 is more than likely the date of proof being #16 for the month of October in 1907. 78/41 is the plug gauge diameter, being a high 9mm or about 10mm if I remember correctly(9,91mm?). Voluntary proof of semi-smokeless powder is noted by the 2 grams of N.G.P. powder behind a load of 12 grams of lead shot. Hum, 44 in a circle is probably the bore. It was proofed in the final state with shot.

Kind Regards,

Raimey
rse