Couple is in their mid 50’s and have been living together for about 20 years. He has never been married - she has. They built a new home several years ago and have pretty much everything that any long time couple has.
I found these wine glasses which I think are nice and different but looking for some other ideas as I’m not 100% sure about these.
http://www.uncommongoods.com/product/wooden-wine-glasses-set-of-2
Since they have “stuff”, perhaps give them an experience, such as a meal at a nice restaurant, or a gift voucher to a theater so they can see a show?
Money!
What are their interests? Do you live in the same city? Maybe a nice dinner out to celebrate their marriage with you.
H suggested gift cert for dinner at nice restaurant but they eat out a lot so I nixed that. Tickets to a show is a possibility. Have to think on that.
Both have very good jobs and don’t need money.
Some “stuff of the month” gift? Wine, fruit, beer, steaks, chocolates, honey, etc. ?
If they are going on a honeymoon, an experience at their honeymoon destination would be fun. That’s one of the best gifts I received when I got remarried and combined two houses (translation… We had an abundance of stuff).
They already do a wine of the month so not feeling another month thingy.
Good idea 1214mom! Don’t know if/when they are going on honeymoon or where. I suppose I can call and ask.
Sorry, I don’t like those wine glasses. Part of the enjoyment of wine is the color, which you obviously can’t see with those. Wine glasses are actually a good gift for an established couple because they break and you can always use more. I’d go with Reidel Bordeaux glasses, in Reidel’s secondary line, or the stemless ones. Never can have too many of those.
I’m curious – do most established couples in their 50s generally disseminate a “no gifts” message? That’s the norm here, but I was surprised when a 50-year-old friend of mine actually registered for gifts. (First marriage for her; second for him).
You might just ask them what they want.
Nothing on the invitation saying no gifts but no indication they are registered anywhere, either.
I like the wine glasses because they are different and works of art-ish.
make a donation to their favorite charity. Or get a nice bottle of wine, or champagne.
Ok, so it looks like they are wine enthusiasts. I don’t know if that is your price point, but a bottle of Opus One is quite a conversation piece! 
If they are wine enthusiasts, I agree the wooden goblets would be a no go. Affects temperature of the wine too.
Opus one is a nice gift. I gave away a bottle once!
I agree a bottle of wine that might be more expensive than they would normally drink is a fun gift. We’ve taken to using the wine goblets that don’t have stems. Easy to throw in the dishwasher.
^ Not my price point. If I was going to spend $$$ on wine I would get a bottle from son’s college roommates parent’s winery (Far Niente.)
They like wine but are I wouldn’t classify them as wine enthusiasts any more then I am. We are fine with cheap wines. I’m pretty sure the wine of the month thing is wines from the Finger Lakes.
Still like the wood wine glasses.
Oooh, love Far Niente! One of the best wineries to visit in Napa, imho. Carry on!
^ We are going to visit them next summer.
Not being pc here. Is this your friends’ style? If yes, purchase it. If they have a registry, follow it. Just because the couple is “old” why shouldn’t they have new things to start and special things to start their marriage?
Life’s celebrations can, in my opinion, can include a bit of “me”.
We know a couple that were each married before and then came together to marry each other. We gave them a very well made, neutral colored afghan, embroidered and they have used it over & over again to cuddle on their back deck & porch. YMMV
Tbh, I don’t really know their style. But I like the design and they are different then typical wine glasses. And if they don’t like them they can always re-gift them!