If he likes maps or traveling how about one of my popular map notebooks? You can personalise them with any location.
https://folksy.com/items/4175518-Map-notebook-you-choose-location-Rhodes
https://folksy.com/items/3269802-Map-notebook-personalised-area-Rhodes
These make cool Father’s Day gifts, most of the pens in my shop work for men’s gifts.
https://folksy.com/items/6652104-Carbon-fibre-fountain-pen-rollerball
https://folksy.com/items/6493861-SPRING-SALE-Blueberry-Retro-Lampshade-Geometric-African-wax-print
https://folksy.com/items/6506280-SPRING-SALE-Animal-print-Lampshade-Black-Brown-Gold-Man-Cave-Decor
Another Father’s day gift idea.
https://folksy.com/items/6653136-Father-s-Day-Gift-Men-s-Leather-Cuff-Mans-Handmade-Leather-Wrist-Cuff-For-Men
An original watercolour painting that’s small enough to pop in with a card!
Just to let everyone know the Father’s Day gift guides are up now, and we’ll be adding in some of your suggestions later this week.
Thanks for all your ideas. Keep them coming.
This one can be personalised for your Dad, Step-Dad, Grandad or even someone who’s been like a Dad 
Glad you’ve done separate Gift Guides for cards and gifts (although a bit sad none of my cards made the list) one thing I did notice was that several card makers had more than one card in the guide which seems a little unfair to all the rest who haven’t made the grade and doesn’t give potential customers as big a range of shops to go browse (I know they have the options at the top but many will simply browse what is in the gift guides)
Perfect for Dads shed,
Father’s Day cards galore a Snappy Crocodile! Here’s an example https://folksy.com/items/6651521-Fixer-Of-Things-Greeting-Card
How about a photograph of a fishing boat as a Father’s Day gift this year?Fishing Boat
https://folksy.com/items/6650877-A4-Photograph-Fishing-Boat-Devon-Beach
A beautiful gift is this fully hallmarked sterling silver chainmaille bracelet. An elegant, timeless quality jewellery piece lovingly handcrafted suitable for both women and men.
https://folksy.com/items/6645906-Sterling-Silver-Bracelet-Persian-Weave-Fully-Hallmarked
Perhaps a glasses case?
https://folksy.com/items/6562680-Glasses-Case-Moustache
Yay: thank you Camilla… I can see you’ve used lots of our suggestions 
) xx