The stamps depict symbolic representations of:

• telegraph
• telephone
• radio
• television 

Catalogue Numbers:

Michel CH 566-569; catalogue value €5.50 ($9.00)
Stamp Number CH 340-343
Yvert et Tellier CH 517-520
Stanley Gibbons CH 532-535
Zumstein CH 309-312

Please note:

You can combine purchases to minimise postage costs.

• 1-9 eligible items - single charge
• 10+ eligible items - postage is free.

If purchasing more than one item, please DO NOT PAY FOR ITEMS SEPARATELY as ebay will charge you postage on every single item.

Instead, add your choices to the shopping cart (use "add to cart").

When you have finished shopping you can view your cart to finalise and pay for the lot at checkout, when your purchases should be automatically combined with the correct postage cost (if any).

https://www.ebay.com.au/help/buying/paying-items/shopping-cart?id=4360

-> The free postage for 10 or more items is for regular postage without tracking. If you require tracking, you need to select the postage method that provides tracking at checkout.