Sliding roof switch. P/N should be 0008206310. Here's one from an 85 W123 and the last number in the secondary part number is different, but the symbol is the same and it's a momentary switch. Now as to why this switch and wiring would be installed in a non-sunroof car...I have no idea.

https://www.ebay.com/itm/MERCEDES-1985-POWER-ROOF-SUNROOF-SWITCH-OEM-PN-000-820-63-10/192929535035?hash=item2ceb7f143b:g:LbUAAOSwHLNc6sfv

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__________________
Lance Allison
Lance@LanceAllison.com

Current:
11 MB S550 4Matic, 55k miles, Designo Black/Black
14 Ford F150 XLT Lariat Crew, 73k miles, 5.0
Coyote V8 4x4. Black/tan.
09 GMC Envoy Denali, 5.3 V8, 4x4 SWB. 38k miles,
Jewel Red/Med Gray.

Gone:
87 MB 300SDL, 320k miles, Astral Silver/Blue.
98 VW Jetta TDI, 488k miles, Classic Green/Gray.
85 Olds 98 Brougham FWD, 4.3 DIESEL V6, 80k
miles, 3x Gray.

MBCA Member, Chicago Region