Possibly /416\ ?
(https://i.ibb.co/tP1K2LZ/attachment-1-1.jpg) (https://ibb.co/cXs38Yb)
/416\
Previously thought to have been /016\
Well let me get in on this with you. I need to send this to RM for his survey anyways. I think 416 and RM guessed by the serial which just amazes me....really. But I haven't pulled her out of the stock yet but I assumed 416.
(https://i.ibb.co/tCfSTXq/IMG-5576.jpg) (https://ibb.co/XJB9r87)
(https://i.ibb.co/4jt2rMF/Screenshot-20181226-131353-Chrome.jpg) (https://ibb.co/qRjCQ9D)
Its almost imperceptible, but at the base of this arsenal stamp you'll find a protruding nub that is the leg of the 4.
100% /416\ based on the ID certs offered from Kengs. thumb1
Can't beat 100%. /416\ it is. Thnx!