Odd Antique Store find. Frankenphone?

[kb3pxr]

I was in the local antique store and I found an odd set. I have no pictures, but I can describe it. It is a wooden Western Electric local battery subset which I didn't get the model of and a non-dial Western Electric Spacesaver mounted to it. The Spacesaver is wired in with tags on the wires that look professional.

The price tag (other than saying it costs $105 firm) says that supposedly it was used for rural service in the 40s and 50s.

Was this an actual installed configuration or a Frankenphone?

Obviously I didn't buy it simply due to the price. For magneto demonstration sets and other purposes I'm better off with either Leich 901s or Military field phones.

[HarrySmith]

The spacesaver can be mounted anywhere. I have seen them mount directly to the subset before.
BTW spacesaver is an AE name.

[Alex G. Bell]

I believe combinations like this (prewired or with wire tags) with were used in industrial settings.