I’m not sure as I’ve no other Higgins to compare it to. I’ve exposed it anyway by removing the paint and it’s solid whether it’s a historic repair or original so not an issue. Rear spacing is 115mm.
HIGGINS ULTRALITE Downtube Decal
RARE Vintage HIGGINS Racing bicycle frame.
Higgins 531 seat post decal
Tortec Tour Ultralite Rear Pannier Rack (Black) - Cycling / Touring / Audax
Tortec Tour Ultralite Rear Pannier Rack (Silver) - Cycling / Touring / Audax
Leatt ReaFlex UltraLite Knee Guards - MTB, Gel Protection Padding, Lightweight