A751-1975 Switzerland Geneva ILO / BIT Service Stamps on Official Envelope Fi

Title
“1975 Switzerland Geneva ILO / BIT Service Stamps on Official Envelope – First Day Cover”
Category
Collectibles → Stamps → Europe → Switzerland
Condition
Used (Cancelled) on original envelope. Good overall condition — please check photos for actual condition, minor wear on envelope.
Item Specifics
Country/Region of Manufacture: Switzerland
Year of Issue: 1975
Topic: International Labour Organization / Bureau International du Travail
Format: Envelope with three service stamps, First Day Cancellation “BIT Jour d’Émission Genève”
Stamp Type: Service / Official stamps (Helvetia)
Cancellation: First Day of Issue, Geneva
Catalogue Number: Switzerland Mi-Numbers likely 1058–1061 for 1975 series (see reference) 
Features: On official envelope bearing embossing of BT/ILO.
Quantity Available: 1
Price & Valuation
Valuation: Based on similar listings: mint never hinged sets of the 1975 ILO service stamps have sold for very low values (e.g., US $1 to US $5 for MNH sets) on eBay. 
Because your item is on a special envelope and cancelled, it may carry a modest premium, but the niche is still modest.
Recommended eBay (Buy It Now) price: £10
Auction option start price: £3 (with no reserve, or a reserve of around £5 if you prefer)
Shipping & Handling: (You may add your shipping cost)
Acceptable payment method: (e.g., PayPal)
Description
Offer for sale is a genuine 1975 service stamp cover from Switzerland issued by the International Labour Office (BIT in French), cancelled on the day of issue (“Jour d’Émission”) in Geneva. The cover bears the three service-stamps for this issue, presented in fine condition. The envelope also features the embossed BIT/ILO emblem on the back. A great item for the ILO/BIT topical collector or Switzerland postal-history enthusiast.
Please view all photos carefully for condition. If you have any questions about the item please ask.