Not sure what the difference is between the MDR-5a and the MDR-5aL1.

Anyone care to comment?

http://www.ebay.co.uk/itm/Rare-Vintage-Sony-Walkman-MDR-5aL1-MDR-5a-Headphones-Made-In-Japan-/111008642826?pt=UK_CE_Cassette_RL&hash=item19d8a1770a