Anyone know and recommend a refinishing shop that might tackle this?  Nothing to do with firearms, but I figured arfcom collectively knows all.

I’m looking to refinish a bunch of these airline seatbelt extenders (Seatbelt Extender).  They look like they’re currently a bright mirror cheap nickel finish - the same as on most car seatbelts.  No idea what’s beneath.   They don’t have to look perfect or even be all that durable, but I’m reusing them in a capacity where they just can’t be bright and shiny.  I suppose I could sand and rustoleum a bunch of them, but if it’s much faster doing it chemically and they’d hold up a little better, I’d consider sending them off.

Any advice or direction on anyone who might do a good job and be willing to refinish seatbelts - would be appreciated
.  Thank you!

You can hit them with some white or green scotch brite or have them bead blasted.

Bead blasting would be my vote

The shiny nickel is electroplated nickel.  Electroless nickel has a more matte appearance, and is harder (48 to 52 HRC, as-plated).