Regarding some rare pre-decimal pennies

[Doubledot1919]

Hello everyone!
My name is Momchil, and I am from a small European country that some of you may not have heard of.
Here is why I am reaching out on this forum. A few months ago, I sent a small collection of PCGS-certified coins to a major European auction house for sale; among them are some interesting Rare pre-decimal Australian pennies. The consignment agreement specifies "sale without a reserve price," and I assumed this was standard practice. The online auction began a week ago, and I received a notification from the auction house and then I realized revealing that some of the coins have been listed with a very low starting price. For instance, one of the rarest pieces—a 1919 "double dot" penny (graded AU55 by PCGS)—has a starting price of just 100 Euros. Another of the coins - 1 penny 1920 English obverse, Dot below scroll (AU55) has a starting price of just 75 Euros.
I am aware that these coins are not widely known in Europe, and outside of Australia and the US, they are unlikely to fetch a good price. However, if such a coin were to sell for only 100–200 Euros, it would be a loss not only for me but for Australian collectors as well. So, my question is: is it possible—without violating forum rules—to somehow alert a few Australian collectors, who would have an interest in these auctions, about the presence of these rare coins in the auction? I would appreciate any advice you could offer on how to proceed.
I believe the online auction concludes on November 12th–13th, after which the coins will pass quickly through a live auction.
Best regards,
Momchil

[Basilstate]

Welcome DD1919,..,that'd a good grade for 1919 DD,throw a link up for the Auction so anyone interested can have a look.Good Luck with it.

[Doubledot1919]

Hello, Basilstate, thank you!
Since you believe that this does not violate the forum rules, I am sharing a link to the six coins that were part of my small collection for several years. All 6 coins are certified by PCGS. The seventh item shown below—a token—is not mine.

Have a great day,
Momchil

https://ha-europe.com/en/search?q=penny+australia&aid=

[autocoupler]

Hi Momchil,

As a collector of pre decimal varieties myself, I share your concern that the opening bids on five of the six coins are way too low. In my opinion, I believe the opening bid for the 1920 dot below Indian obverse is about right for a winning bid. Good luck with getting your information out into the main stream.

[Doubledot1919]

Autocoupler, thanks!
Yes, the prices are low, but I noticed in past Heritage Europe auctions that a significant number of coins end up selling for 5–6 times their starting price; so, the low starting price is likely a tactic they use to attract watchers.