Sally, unfortunately, this is an issue that has more than a few varieties (e.g., color, design, grilled gum) that are difficult to determine by only a scan.
Do you have a Scott catalog? If so, then see Switzerland 227-236, 243, and 316-321. Note some denominations have color varieties, and the 10c/20c stamps have design varieties. The grilled gum varieties are usually worth more (slightly to significantly). Even though your stamps are used, you can still detect grilled gum varieties. Turn the stamp face down and look under a strong light. You should be able to see a light impression of a fine array of horizontal and vertical lines. The grilled gum affects the paper, so that even though the gum is gone, the impression can still be seen. You might need a magnifier.
If you don't have a Scott catalog, let me know and I'll try to walk you through some questions.
BTW, thanks for being upfront and honest about your plans to sell the stamps.
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Posted 11/05/2011 6:24 pm
