Just got this guy off of eBay. It's a 1900/1901 model that takes standard SE blades.
It's in really good shape except that the lid is torn off of the box.
I wasn't going to buy any more GEMs but the handle on this one caught my eye.
The stropping attachment is stored inside the handle. The knurled rim at the bottom is how it screws in and out of its storage area. That knurled rim has a threaded hole in the center so that the handle can be removed from the shaving head and used as a handle for the stropping attachment.