Well - I'm not much of a mathematician, but I would say that this data

Serial #...Shipped
2773 ...... Sept. 1, 1879
6561 ...... Aug. 9, 1881
6740 ...... March 7, 1882
6763 ...... March 15, 1882
8823 ...... March 9, 1880
18099...... Nov. 11, 1883
24672...... Aug. 11, 1904
28501...... Aug. 12, 1896
29035...... Sept. 4, 1893
31779...... Aug. 7, 1899

looks pretty good. All those guns were shipped in about a 25 year period.

That is about all you can say about them !

Regards, Mike Priwer