Just thought I ought to bring this one to the attention of the collectors of Ancient coins on this forum. I am not involved in this company, although I know the chief auctioneer through membership of a local coin club. http://www.dnw.co.uk/coins/auctions/rostrumauctions/auctioncatalogue Not often you see Otho on a list - and they have two. Also stacks of Roman and Ancient Greek. Auction date is 10th April... On the link I have copied, you need to change "Auction" in the top box to select "Ancient Coins" and then you can browse or search as you see fit.
Dix Noonan Webb is a good company. The dealer who represents me in European auctions regularly attends.