AP20 Scroll Pattern Push-Up Arm Semi-Auto Oil Lighter

AP Series 1930–1939: Pre-War Gold Mass Production Period

Standardized models available in 3 sizes: No.20 (Mini Portable, i.e., AP20), No.40 (Standard Medium), and No.60 (Large Gentleman's Pure Silver). Also released with etched, enamel, pure silver, and gold-plated finishes—the most collectible batch.

1940–1945 WWII production cutback

Civilian lighter production capacity is reduced; only a limited number of simplified, plain-body models without engravings are manufactured for military and civilian supply. Engraved casing production lines have been suspended.

1946–1950 Late post-war recovery phase

Restarted Production Line No. 20/40/60, but with significantly simplified casing decoration, thinner plating, and reduced etching patterns; material quality was compromised. Gas lighters gained popularity while kerosene model sales continued to decline.

1955–1962 Discontinued

Mass production of 1955 kerosene lighters ceased in 1962, with only sporadic repair parts available; the factory officially closed in {2}, rendering all patents and molds obsolete. No new original units have been produced since.。