When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Item: Vintage original AT&T / Western Electric Merlin Communications System 410 Key Service Unit (KSU / Control Unit) equipped with installed Feature Package 2 / V1 cartridge.
Model & Nomenclature:
Manufacturer: AT&T / Western Electric
System: Communications System 410 (Model 410 Control Unit)
Cartridge: Feature Package 2 / V1 (installed in top expansion bay)
FCC Reg. No.: AS593M-13529-KF-E
Barcode Part ID: 6110 01 000 099 321
Features & Configuration:
Up to 4 Central Office / Tel. Co. Lines (labeled A, B, C, D RJ11 jacks).
Up to 10 Voice Terminals / Station Extension Jacks (labeled 10 through 19).
Auxiliary screw terminals for Paging Signal, Background Music input, and Music On Hold (T, R, 1, 2, M1, M2).
Tone/Pulse dialing selector and front DIP configuration switches (Admin / Toll Prefix).
Heavy-duty composite housing designed for either tabletop placement or vertical wall mounting via rear keyhole slots.
Condition & Testing:
Cosmetics: Fair to good vintage condition. Case is structurally intact with no major cracks. Exhibits noticeable surface dust, scuffs, and storage grime from long-term storage that will clean up nicely.
Cover: Unit is missing the front snap-on aesthetic faceplate cover; the main terminal face and cartridge bay are exposed as shown.
Testing: Untested. Power cord is not included (uses standard 3-prong IEC AC cable). Sold strictly as-is for vintage telecom collectors, parts, repair, or classic office system restorations.
