An anniversary gift for a father-in-law is not really a gift for one person. It is opened at a table, in front of the person he has been married to for decades, and the safest read is something that serves the household or the two of them together. That single filter cuts most of the 'gifts for him' aisle immediately.
Which is why the trolley set leads. Two bags, a cabin and a medium check-in, is a gift that implies a trip, and the 3-year global warranty means it survives the actual travelling rather than just the unwrapping.
The two air purifiers make the same household argument more quietly. In most Indian cities a bedroom purifier earns its keep for three or four months a year, and neither of these needs an app, an account or a subscription to work — controls are on the unit. Match the room before the brand: the Purocell is rated to 180 sqft, the Fulminare quotes a far larger figure that sits oddly against its own 'small air purifier' framing, so measure and be sceptical.
The two watches are the personal option and they split cleanly. The Casio is the spec choice — 50 metres of water resistance, a fold-over clasp with safety, and a stated two-year manufacturer warranty. The Titan is the occasion choice: blue dial, two-tone silver and rose gold strap, date at 6 o'clock, but its listing gives no depth rating and no warranty period. Pick the Casio if he wears one watch for everything; pick the Titan if he already has a daily watch and this is the dressy second one.
A note on the count: five picks, not the ten this bracket usually carries. The verified Amazon India catalogue in this band for this recipient is genuinely thin right now, and five real listings beat ten padded ones.