A682-East Germany DDR 1976 “IX. Parteitag der SED” First Day Cover Block of 1

Title:
East Germany DDR 1976 “IX. Parteitag der SED” First Day Cover / Block of 1 M Stamp – Leipzig Leninstrasse 16
Category:
Collectibles → Stamps & Postal History → Germany (including DDR) → First Day Covers
Condition:
Pre-used/Collectible – Good overall condition, first day cancellation present, original envelope with light wear/corners slightly bent. (See photos for condition details.)
Item Specifics:
Country/Region of Manufacture: East Germany (DDR)
Year of Issue: 1976
Type: First Day Cover (FDC)
Stamp-Denomination: 1 M (Mark)
Event: IX. Party Congress of the Socialist Unity Party of Germany (SED)
Cancellation Location/Date: Leipzig, Leninstrasse 16 – first day of issue stamp/cancel
Features: Cachet showing Party congress imagery, block sheet, envelope marked “Ersttagsbrief”
Certification: None provided
Price & Valuation:
Valuation estimate (based on similar DDR first day covers) – Many DDR FDCs are modestly valued (many in the £3-£10 range) according to online listings. 
Given the theme (party congress) and the clear graphics, I’d estimate a fair value around £8-£12 for this piece in good condition.
Recommended eBay Listing Price:
Fixed Price: £14.99 (to allow some margin above estimated value)
Or “Buy It Now” plus “Best Offer” enabled.
Auction Option:
Start Price: £4.99
Duration: 7 days
With a Reserve Price (optional) of about £10 to protect value.
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