Alfa Laval 6123708227 — V-belt, narrow section SPB, nominal length 2650 mm, as marked on the belt.
Drive belt for a belt-driven machine. SPB is the belt section and 2650 the nominal pitch length in millimetres, to the DIN 7753 and ISO 4184 narrow-section series.
Alfa Laval buys belts in rather than making them, so the belt itself will carry the name of whoever made it — Optibelt, Gates, ContiTech or similar. That is the marking to read; the Alfa Laval article number is what to order against.


