What does the special sign on the King's side pieces look like?

In Edward Lasker's Chess Strategy (1915) he wrote:

"Many sets of chessmen have one Rook and one Knight stamped with a special sign, to show they are King's side pieces. This is not necessary in the case of Bishop's [because they always stay on one colour]."

The purpose of this mark was to prevent confusion when distinguishing between the Rooks and Knights in the middle game when using old notation (e.g. King's Rook to Queen's Bishop's first). Nowadays, there's no need to distinguish between Kingside and Queenside pieces because we use algebraic notation and only focus on the squares (e.g. Rfc1).

My question is: does anyone know what these special signs looked like and could they share some images? It seems chess sets don't give these stamps anymore and I can't find any samples on Google.

A small crown. Often red in color.

Reproduction sets have them today, so you can get a new set that has them if you like.

here is a stamped rook (reproduction jaques set from chess bazaar)

Here's a couple of examples.

-Izmet Fekali

http://bestchessmenever.com

Heh I was about to say, NOJ sets tend to have an option for you to get the old stamps, or not.

What do you mean by NOJ sets?

A wood shop in europe that makes luxury chess sets. The post above mine has both a picture and a link. They have option for you to stamp a set you buy from them. But any makers period reproduction set is likely to have those marks.

Thanks for sharing images BattleDuck and ifekali. I would like a set like this in the future. What do I type in on chess bazaar to find a set like that, @BattleDuck?

Look for “Reproduced” “antiqued” “vintage” “jaques” “Staunton” etc, anything to signify its an old design. Usualy there are whole categories:

https://www.chessbazaar.com/chess-pieces/reproduced-jaques-vintage-collection-chess-pieces.html?amp=1

but please note it’s not just chess bazaar. House of station, noj, Stauton castle will all have stamped sets. And for a reproduction I’d personally consider them over chessbazaar.

Thanks. Quite pricey though!

Yes! Reproduction sets tend to be more luxury category, so they will be pricey and if spending that much I prefer to get a set from a premium source. So House of Stauton, NOJ, Stauton castle. Etc

On a budget you can just put a couple stickers on one rook and one knight per side of any set you already have  any mark will do if you just want to use the set while reading an old book.

That would work, but unfortunately my reasons are not practical and more for "aficionado" purposes.

I would link to see the FIDE Official Set stamped! White side stamps by a black hexagon and Black side stamps by a white hexagon. Will this be cool? 

What I have seen that was very interesting was a the stamp in white on the dark pieces and brown/black on the light pieces.  I believe @QtoQlevel3 had this custom requested though.  

Why a hexagon? The official stamp should be in the symbol of a King’s crown to symbolize the “king’s side pieces.”