Yep, bought up at the beginning of WW2 and used to train pilots/gunners on how to properly lead targets.

Is it an engraved 720, or plain sided? They had both. This is a plain sided one:

[Linked Image]

[Linked Image]

“The Savage 99 Pocket Reference”.
All models and variations of 1895’s, 1899’s and 99’s covered.
Also dates, checkering, engraving.. Find at www.savagelevers.com