Yes, that's correct. Just the Zero serial " 3127 " seems to be the same that the "127". It looks like the 3127 can be its full number. The digit "3" may means the factory the A6M2 was assembled by. Then they mounted the trim tabs for 80 planes only. The Mitsubishi engineers suggested leaving the trim tabs but the IJN ordered removing them because of being not sure what was the reason for the crash of the Cpt. Shimokawa , test pilot who was killed during trials on 17th April 1941. Begining the May 1941 the external mass blance was restored and attaching untill the September 1941 when the aileron with the internal mass balnce was introduced.