Is this flat bottomed? Can it be used on a mug/cup warmer that is plugged in?

The bottom of the mug is very slightly beveled on the bottom, but otherwise is flat and should make contact enough with the mug to warm it. Be careful though, since the outside will also get hot to the touch as much as the inside.

Is this mug seamless on the inside bottom and around the lip? Thank you!

Yes. Seamless on the interior bottom and around the lip. One seam around the exterior bottom. It's a great cup with a great lid

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IsosteelVacuum Travel Mug VA-9583 20 liq. oz (0.6 liter) 18/8 Stainless Steel

Product ID: 330190012

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Description

Specifications

Reusability	Reusable
Product Care Instructions	Hand Wash Only
Material Features	Insulated
Material Type	Stainless Steel
Item Weight	0.9 Kilograms
Number of Items	1
Unit Count	1 Count
Capacity	0.6 Liters
Shape	Round
Pattern	Solid
Theme	Hot or Cold Drink
Occasion	Cocktail Party
Color	Silver
Style Name	Modern
Additional Features	Break Resistant

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