It so you can change the blades between shaves. I believe.
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Thanks doc for the reply.
Yes to have more than one blade ready for shaving, handy when traveling and so, but I was thinking maybe when it gets old, the blades may get loos during a shave. Not sure if it will happen.
Looks like a cool collector's set. Also appears that the third blade may have been left attached and gotten a bit corroded due to humidity or moisture of some type. It is not clear from the pictures whether the mechanism for holding the blades onto the base assembly is intact and still in working condition.