The original chain on the ELF was a Wipperman Connex 1R8. Legendary german chain… Not sure what is on there now.
Connex 1R8 1/2 x 1/8 Nickel Heavy Duty
Connex R8 chains are great for all cases where the chain must resist extraordinary loads: on heavy-duty bikes, touring bikes, cargo bikes, or velo-taxis. The high-grade nickel coating protects the chain against corrosion, and the steel links provide for a long lasting durable chain..
Alloy steel inner and outer links, both nickel-plated
For all hub gears with wider cogs and single-speed
10.5mm pin width
Traditional master link with spring clip included
Brand: Connex http://www.bikeman.com/CH1889.html