复古北美邮票网格

Goal: Create a clean gallery sheet of vintage illustrated postage-stamp designs for an atlas-style North American city collection, presented as collectible UI/export assets.

Canvas: Landscape canvas, about 870×653 px, off-white background with generous margins and even spacing. Arrange the stamps in a precise 3-row by 6-column grid, for exactly 18 stamps total. Each city appears as a pair: first a sepia monochrome stamp, then a muted full-color version.

Layout: Use three horizontal rows with six stamps per row. Leave wide white space between stamp pairs and rows. Add faint small gray export filename captions under the paired groups, aligned near the lower left of each pair, such as “stamp-export-atlas-north-america-46”, “stamp-export-atlas-north-america-47”, “stamp-export-atlas-north-america-48”, continuing through the visible groups.

Stamp design: Every stamp is vertical with cream perforated edges, aged paper texture, thin ornate border, and an oval or arched central illustration window. Put “SOL” in the top-left corner and “100” in the top-right corner of every stamp. At the bottom of each stamp, include a ribbon banner with the city or neighborhood name, then stacked location text below it. Use engraved linework, antique travel-poster composition, soft shadows, and slightly worn ink.

Exact stamp count and labels: Include exactly 18 individual stamps in this order, left to right, top to bottom: 1 sepia Boston, Massachusetts, United States with a narrow historic street scene; 2 color Boston, Massachusetts, United States with red-brick buildings and a streetlamp; 3 sepia Charlotte, North Carolina, United States with a cozy storefront street and a “Noda” sign; 4 color Charlotte, North Carolina, United States with colorful buildings, plants, and blue sky; 5 sepia Chicago, Illinois, United States with a vertical “Chicago” theater sign and urban architecture; 6 color Chicago, Illinois, United States with the same theater sign in warm gold and teal tones; 7 sepia Wicker Park, Chicago, Illinois, USA with a storefront facade; 8 color Wicker Park, Chicago, Illinois, USA with an orange-brick storefront and teal sign; 9 sepia Cincinnati, Ohio, United States with a historic market building; 10 color Cincinnati, Ohio, United States with the same market in brick orange, green trim, and sky-blue background; 11 sepia Cleveland, Ohio, United States showing a grand arched arcade interior; 12 color Cleveland, Ohio, United States with teal glass ceiling and warm interior perspective; 13 sepia Dallas, Texas, United States with skyline and a “Deep Ellum” sign; 14 color Dallas, Texas, United States with lively street colors, teal sky, and Deep Ellum sign; 15 sepia Denver, Colorado, United States with a blue bear statue form against a glass building; 16 color Denver, Colorado, United States with a bright blue bear and green glass facade; 17 sepia Des Moines, Iowa, United States with a Tudor-style house; 18 color Des Moines, Iowa, United States with red roof, cream walls, green lawn, and blue sky.

Text content: Keep the stamp typography uppercase and vintage serif. Use the customizable collection mark {argument name="stamp currency text" default="SOL"}, denomination {argument name="stamp value" default="100"}, and export caption prefix {argument name="export filename prefix" default="stamp-export-atlas-north-america"}. Preserve the city labels as readable English, but allow the overall series theme to be {argument name="atlas region" default="North America"} and the visual finish to be {argument name="stamp finish" default="alternating sepia engraving and muted full color"}.

Visual style: Antique engraved postal ephemera, travel stamp sheet, cream paper, scalloped perforations, subtle drop shadows, fine hatch shading, warm browns, faded inks, muted teal, rust, ochre, brick red, and sky blue. Make the colored stamps look hand-tinted rather than modern digital. Keep all stamps consistent in size and framing.

Constraints: Do not add people, logos, watermarks, or extra stamps. The key requirement is exactly 18 stamps in a 3×6 grid, with paired sepia/color variants for the 9 listed places, readable city/state/country labels, “SOL” and “100” on every stamp, and faint gray export filenames beneath the groups.