Hi and welcome,
The jersey is a EQT premier jersey. Reebok make 3 types, The replica (screenprinted numbers etc), the EQT premier ( a single layer number with screenprinting) and the Authentic ( up to three layer sewn numbers).
You can tell by looking at the jocktag at the bottom of the jersey. The EQT has a helmet on the tag, this is the only type that has this, so you know by that. The authentic is the only type that uses a number code for the sizing, both the replica and EQT use letter codes.
You'd expect to pay around £60 - £70 for an EQT so not a bad price.
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