The Christie ballpoint is regarded as a popular and sought-after collector model whose value today lies above the then retail price, provided the condition is near-new or objectively hardly used; a concrete price determination takes place by comparison with completed eBay auctions, since fixed prices do not exist. A missing certificate tends to reduce the value but does not preclude price-finding. For storage, writing instruments should not be placed loose with other pens in a collective box, since body and trim can quickly be scratched; more suitable is a multi-piece case with internal separation. A sale is not recommended, since the model counts as a classic.