It's hard to say precisely, because there were several different RG370 models made in the mid-to-late 90's that have material differences — some are made in Japan, others in Korea; some are made of Resoncast (essentially MDF); etc. In addition, a major portion of the value of a 20+ year old guitar is in the condition of the individual example. Also, values are impacted by local market conditions, a guitar that would sell for US$200 in Los Angeles might bring twice as much in the Philippines, for example.

In general, I wouldn't want to pay much more than US$250 for any RG3xx series guitar. I can find RG5xx guitars for just a little bit more than that which are generally much more stable, so it caps the value of the lower end models.

If you have a specific guitar in mind, feel free to share some pictures or a link to the sale listing and I'll try to give you a better idea on the actual value.

 \m/ DeeJayK^Talk! 13:32, August 7, 2019 (UTC)

Thanks for your help. Been offered it in a trade and I'm not really an Ibanez man but it's a trade for about £100 of pedals so seems a good deal

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That's a Korean made RG370B from 2003. Looks to be in decent enough condition. Definitely worth £100 in my opinion.

 \m/ DeeJayK^Talk! 15:30, August 7, 2019 (UTC)