A626-“1979 GB Royal Mail ‘Horseracing Paintings & Bicentenary of The DerbyFDC

Title:
“1979 GB Royal Mail ‘Horseracing Paintings & Bicentenary of The Derby’ FDC – 6 June 1979”
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Category:
Collectables → Stamps → First Day Covers → Great Britain
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Condition:
“Excellent used condition. Clean envelope with original 6 June 1979 first-day cancellation from Edinburgh, stamps intact, insert card present. Minor corner wear only (see photos).”
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Item Specifics:
Issue Date: 6 June 1979 
Topic: Horseracing / Paintings / Derby
Stamp Set: 9p, 10½p (10.5p), 11p, 13p values 
Format: First Day Cover (FDC) with stamps & cancellation
Origin: United Kingdom (Royal Mail issue)
Certification: None included
Insert card: Yes (as shown in photos)
Overall grade: Very Fine (VF)
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Valuation / Recommended Pricing:
Based on recent listings:
A similar listing shows this FDC available for from £0.99 “Buy It Now”. 
Pricing guides list this issue (SG 1087-1090 / Scott 863-866) at approx £0.55 for FDC in standard condition. 
Given this, a reasonable valuation is around £1 to £5 for a typical item in good condition.
If your cover is especially crisp, uncreased, with perfect gum/cancellation and insert, you might aim slightly higher (say £7-£10), but there appears little premium demand.
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Suggested Listing Price (Buy It Now):
£4.50
This sits above recent floor listings and leaves room for negotiation.
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Auction Option:
Starting bid: £1.00
No reserve (or a low reserve at £2) to attract interest, with a “Buy It Now” at £4.50 option.
Auction duration: 7 days.