Picked up a boxed SRF-80W with MDR-2L1 (MDR-3L2 for the TSP-L2) and decided to do some research on headphones to what model walkman. Found this site of service manuals that looks like it is arranged in order of oldest to most recent?
Site address is

http://www.analogalley.com/m_sony_2.htm

Also good site with Sony model with headphone model listed is Japanese , just use google translate web page to make language you want.

http://www.asahi-net.or.jp/~an.../walkman/walkman.htm

SONY HEADPHONE MODEL NUMBER LIST

MDR-004 & MDR-008 Stereo Headphones Service manual

MDR-004, MDR-006, MDR-006L, MDR-008 & MDR-008TV Stereo Headphones Service manual

MDR-005, MDR-005L & MDR-005V Stereo Headphones Service manual

MDR-010 & MDR-010SB Stereo Headphones Service manual

MDR-1L1 Stereo Headphones Service manual

MDR-2L1 Stereo Headphones Service manual

MDR-3 Stereo Headphones Service manual (PDF)

MDR-3L2 Stereo Headphones Service manual

MDR-4L1S Stereo Headphones Service manual

MDR-4T Stereo Headphones Service manual

MDR-05T, MDR-15T & MDR-10II Stereo Headphones Service manual

MDR-10L, MDR-10LE & MDR-10T Stereo Headphones Service manual

MDR-12, MDR-22, MDR-012, & MDR-022 Stereo Headphones Service manual

MDR-20LE Stereo Headphones Service manual

MDR-30II Stereo Headphones Service manual

MDR-30T Stereo Headphones Service manual

MDR-31A Stereo Headphones Service manual

MDR-40L Stereo Headphones Service manual

MDR-40T Stereo Headphones Service manual

MDR-50L Stereo Headphones Service manual

MDR-A20L & MDR-25L Stereo Headphones Service manual

MDR-A25SPL Stereo Headphones Service manual

MDR-A40 & MDR-A40V Stereo Headphones Service manual

MDR-A50LV Stereo Headphones Service manual

MDR-A60 Stereo Headphones Service manual

MDR-CD6 Stereo Headphones Service manual

MDR-CD333 Stereo Headphones Service manual

MDR-CD555 Stereo Headphones Service manual

MDR-CD777 Stereo Headphones Service manual

MDR-CD999 Stereo Headphones Service manual

MDR-E22 Stereo Headphones Service manual

MDR-E140C Stereo Headphones Service manual

MDR-E142 Stereo Headphones Service manual

MDR-E212 & MDR-E222 Stereo Ear Receiver service manual

MDR-E225 Stereo Headphones Service manual

MDR-E242 Stereo Headphones Service manual

MDR-E265 Stereo Headphones Service manual

MDR-E282 Stereo Headphones Service manual (PDF)

MDR-E414, MDR-E424, MDR-E414MK2, MDR-E414V & MDR-3424V Stereo Headphones Service manual

MDR-E434 & MDR-E434RV Stereo Headphones Service manual

MDR-E444V Stereo Headphones Service manual

MDR-E464 Stereo Headphones Service manual

MDR-E484 Stereo Headphones Service manual (PDF)

MDR-FM3 Stereo Radio Headphones Service manual

MDR-FM5 Stereo Radio Headphones Service manual

MDR-IF5K Cordless Stereo Headphones Service manual

MDR-M22 Stereo Headphones Service manual

MDR-M33 Stereo Headphones Service manual

MDR-M44 Stereo Headphones Service manual

MDR-M55 & MDR-M77 Stereo Headphones Service manual

MDR-P1 Stereo Headphones Service manual

MDR-P3 Stereo Headphones Service manual

MDR-R10 Stereo Headphones Service manual

MDR-S30V Stereo Headphones Service manual

MDR-S101, MDR-S101MK II & MDR-S202 Stereo Headphones Service manual

MDR-S303 & MDR-S303MK II Stereo Headphones Service manual

MDR-S505 Stereo Headphones Service manual

MDR-V1 Stereo Headphones Service manual

MDR-V2 Stereo Headphones Service manual

MDR-V3 Stereo Headphones Service manual

MDR-V4 Stereo Headphones Service manual

MDR-V6 Stereo Headphones Service manual

MDR-V7 Stereo Headphones Service manual

MDR-W3 Dynamic Stereo Headphones Service Manual

MDR-W5 Dynamic Stereo Headphones Service Manual

MDR-W20L & MDR-W25L Stereo Headphones Service manual

MDR-W30L & MDR-W30L (B) Stereo Headphones Service manual

MDR-W50 & MDR-W50L Stereo Headphones Service manual

Thanls for posting the list-I own a pair of MDR-E424 headphones myself.