Well, I may stand corrected. Looking at the SN on the ISMACS list it dates to 1891. (SN 10346879) I thought it might be earlier because of the patent date on the front slide plate (1886) I was going off photos I found to identify the model. I don't have anything in my collection really to compare it with, but it is too big to be a 27 I believe. This is a pretty large machine. Bigger than my 15 clones. (I don't have a Singer 15) Alekia has the same machine and we thought we had identified it as a 115 but maybe we were mistaken.