It's a model 66 and
this is what it once looked like. (I found the picture on
this blog). Is the serial number is G0082927? It's for some reason listed as a model 27 made in 1910 on
ismacs. Double check the number. F.ex. if the first 0 after the G could be read as a 6 it lists as a model 66 made in 1918, dirt and bad embossing can make it a bit of a guesswork.
It's still a very nice model,
this page have some interesting info on it. I have a 99 which is the smaller version of it.