Translation request:inscription on empty aerial bomb

[JCB]

Hello all. This inscription is painted on a relic inert Japanese Aerial bomb. Can anybody offer to translate? It probably has something to do with action in China. Thanks in advance.

Jim
Japaneseordnance at yahoo.com

[GHP]

1937日華事変当時爆弾
1937 Nikka Jihen Tōji Bakudan
A bomb from the time of the 1937 Japan-China incident


--Guy

[JCB]

Guy thank you so much. I believe the "S 12" probably means Showa 12 (1937) . Thank you!!!!!

Jim