I recently picked up this lovely fawn and brown Singer 185K sewing machine from a thrift store.
In this video, I go through assessing and servicing the machine.
This machine is in fairly good condition and is sporting its original brown belt and bobbin winder rubber ring. The foot controller and power plug however are not the original brown colour.

I also picked up another faun and brown 185K from the recently acquired museum collection. That machine isn't in as good a condition but it has the original brown foot controller and power plug. I'll put these with the machine from this video to get the machine closer to original. Unfortunately, neither of the machines has the original brown power flex.

The first museum collection video    • The Museum Sewing Machines Arrived! L...  

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Index:
0:00 Introduction
2:49 Quick test and electrical safety
5:56 A general look at the condition
6:46 Servicing the machine
20:08 Cleaning
24:10 Non functional light
26:55 A look at another machine with original brown foot controller
29:02 Bobbin winding
30:38 Installing the bobbin
31:10 Installing a new needle
31:34 Top threading
32:32 Test sewing
33:57 Conclusion and thanks