Advice needed: original Ladymatic dial or later replacement?

Hello everyone,

I recently purchased this vintage Omega from a Japanese seller on ebay and would appreciate some help understanding whether the Ladymatic dial is likely original to the watch or not.

The watch appears internally consistent based on the seller’s photos:

• Reference: 551.005
• Movement: Omega cal. 660 (manual wind)
• Serial: 23325668
• Estimated production date: approximately 1965–66 based on the serial number

The watch arrived in excellent condition and is running well. It requires daily winding, which seems normal for a manual-wind.

My question concerns the dial. The watch is signed “Ladymatic,” but my understanding is that Ladymatic was originally Omega’s automatic ladies line. Since this watch contains a manual-wind cal. 660, I am trying to determine whether:

1. Omega originally sold some ref. 551.005 / cal. 660 watches with Ladymatic-signed dials, or
2. The dial may be a later Omega service replacement or redial.

The seller stated that the dial is original. And it came with an omega stamped buckle and old straps. I am trying to understand whether this specific dial configuration would have been correct from the factory.

I’ve attached photos of the dial, movement, and inside caseback (the photos are from the seller’s listing, the watch looks identical to them, however I haven’t opened the caseback myself to verify the inside components)

Any information, catalogue references, or examples of similar watches would be greatly appreciated.

Thank you!

cal 660 is automatic movement and yes Ldymatic = automatic so nothing wrong with dial

Feels like something is broken if it's required to be wound every day
also it is wrong to do this manually