Some links that may be of use.......
Antiquers Forum: The forum members have a lifetime of antiques expertise covering a wide range of subjects. There is a strong US presence, but Antiquers also has members from all over the world giving global expertise. We have found them invaluable for insight and identification of items with the added bonus of a strong sense of support and community. Well worth registration for full functionality
20th Century Glass Encyclopedia Comprehensive guide to modern glass https://www.20thcenturyglass.com/glass_encyclopedia_home.htm
Great Glass Useful guide to identifying some makers marks
The Paperweight People:
Conducting a reverse image search can be a good way of identifying an obscure object or painting/print. Each work by uploading an image from your computer and the search engine then tries to find relevant matches.
Tineye: Our preferred engine as it seems to identify only relevant matches
Google: We have found this less useful as it appears to find several non-relevant matches
US Patent Office
Pottery, Porcelain and China:
Gotheborg: Excellent site for Chinese and Japanese ceramics. Front end is free but annual subscription required for full functionality http://gotheborg.com/
The Potteries: Superb reference site for Staffordshire pottery.
20th Century Forum: A good site for getting other members feedback on unidentified pottery (and glass)
Nicholnack: Australian site specialising in Royal Doulton and Carlton Ware
Replacements: An American site that has a extensive index of patterns
Antique Marks: Wide ranging site for antique marks on pottery and more
Vectis Good site for buying collectable toys and checking values
Ebay: Ebay remains the main online auction site for the moment although it appears to be moving to more of a mall for online major outlets. However it has millions of items for sale including a huge quantity of collectables. Searching completed listings can provide useful price comparisons with the caveats that condition may vary, sellers may classify items incorrectly and national markets may vary tremendously and it can be dangerous to apply USA values to the UK market and vice versa.