Jarmez

I have recently come across an auction locally for an Epiphone ES-335 model. There is no serial number embossed on headstock, no sticker I can see in f holes. Also, it has noticeable yellowing to binding and finish - I thought this was something that only happened on nitrocellulose finished guitars and I thought Epiphone didn’t do this? I am wanting to find out year/model and if this is worth buying - current auction price is $35USD images here: https://imgur.com/a/TxepI2J