Here are a few I know about. Not sure how close they are to you.
Philadelphia Rust Proof Co Inc
Philadelphia Rust-Proof Company - Home Page
2086 E Willard St
Philadelphia, PA,
19134-3240
Provides tin, lead, cadmium, copper, electroless nickel, silver, gold & zinc plating services; metal finishing Gold, Silver, Platinum, Plate, Ferrous alloy plate, Non ferrous plate, Iron plate, Steel plate, Stainless steel plate, Aluminum plate, Magnesium plate.
Revel Capewell Inc
303 W Oak St
Norristown, PA,
19401-3755
Nickel, electroless nickel, tin, zinc, silver, gold & cadmium metal plating Gold, Silver, Platinum, Magnesium plate, Titanium plate, Copper plate, Brass plate, Bronze plate, Zinc plate, Tin plate, Lead plate, Plastic plate, Rubber plate, Concrete plate, Precious metal plate, Nickel plate, Plate
Multiflex Plating Co Inc
Multi-Flex Plating Company
109 Willows Ave
Collingdale, PA,
19023-4024
Electro, nickel, zinc, silver & cadmium plating; anodizing & passivating Ferrous alloy plate, Non ferrous plate, Iron plate, Steel plate, Stainless steel plate, Aluminum plate, Magnesium plate, Titanium plate, Copper plate, Brass plate, Bronze plate, Zinc plate, Tin plate, Lead plate, Plastic plate, Rubber plate