I have on average 50++ watches, as it's Ebay’s rules and regulations that they cannot disclose the customers (watchers) Ebay user ID so I’m unable to ask the customer (watcher), if they need any assistance.   I would like to treat my customers (watches), like a customer walking into my shop and they start browsing (watching) and I ask them if they need any help.

Simple, first line of your listing description should be "Should you need any advice or have any questions that need answering please do not hesitate to use the 'ask a question' link at the bottom of this page".

We know that buyers rarely read the whole description which is why I suggest putting it ad the first line.

If sellers could see that I was watching their item and they were able to contact me directly I would watch very few items.  Unsolicited contact may be viewed as spamming.