Credits to Foamy and Marty Birdman!

Burning Flames Letch's LED

New price: 78 keys

[proof below]

SALE #1 = not using

http://backpack.tf/profiles/76561198043936328#!/compare/1493683200/1493769600

Using there

SALE #2 = 78 keys

http://www.tf2outpost.com/trade/29198279 - B/O was 78 in the second sale

http://backpack.tf/profiles/76561198043936328#!/compare/1496793600/1496880000 - Caps at 78

Only other recent LED sale:

http://backpack.tf/profiles/76561198100007274#!/compare/1496966400/1497139200 - LED + Aces KE for duped PE Swagman + ~3 in sweets, bulky

Duped PE Swagman mini (for curiosity's sake):

http://backpack.tf/profiles/76561198344933095#!/compare/1495843200/1495929600 - 55 pure and 6 ref, took a month

SUMMARY

Sales: 78 keys

Sellers: -

Going with 78 keys flat.