The ESP Guitar Company

No, back then there were Standard versions and Custom Shop versions
Standard version Signature Series have the SS serial number, Custom Shop versions will have K or S Serial numbers depending on the model specs(K for neck-thru or set necks, and S for bolt-on models)

Most ESP Standard and Custom Shop signature models are not easily distinguishable by the looks
with a few exception like Alexi Laiho's model and Kiko Loureiro's model

Alexi's Custom Shop version will have the CUSTOM SHOP letters directly under the ESP logo while the Standard versions don't

For Kiko's signature Fire K model, there's also a "Custom" right besides the ESP logo on the Custom Shop version.

It was until they discontinued all ESP Standard Series (rebranded into E-II) did all Signature Series became Custom Shops.

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